docs: def _rect_fitness(self, max_rect, width, height):
          """
          Arguments:
              max_rect (Rectangle): Destination max_rect
              width (int, float): Rectangle width
              height (int, float): Rectangle height
  
          Returns:
              None: Rectangle couldn't be placed into max_rect
              integer, float: fitness value 
          """
          if width <= max_rect.width and height <= max_rect.height:
              return 0
          else:
              return None